<nav class="uk-navbar" style="height: 49px">
    <a class="uk-navbar-brand" style="height: 100%; margin-left: 150px"><img src="img/logo.png" style="height: 100%"></a>
    <div class="uk-navbar-flip" style="height: 100%; margin-right: 150px">
        <ul class="uk-navbar-nav" style="height: 100%">
            <li style="height: 100%">
                <a class="nav_button" ui-sref="login" style="height: 100%;line-height: 49px">登录</a>
            </li>
            <li style="height: 100%">
                <a class="nav_button" ui-sref="signup" style="height: 100%; line-height: 49px">注册</a>
            </li>
        </ul>
    </div>
</nav>
